8.4 Electron Domain Geometry and Molecular Geometry | High School Chemistry

In this lesson, Chad covers VSEPR Theory (Valence Shell Electron Pair Repulsion) and Molecular Geometry. He begins by explaining how the different pairs of electrons around an atom (the electron domains) spread as far apart as possible in order to minimize repulsions leading to three basic electron domain geometries: linear (2 electron domains), trigonal planar (3 electron domains), and tetrahedral (4 electron domains). [Geometries for 5 and 6 domains are omitted here but are covered in Chad’s General Chemistry playlist.] Chad then differentiates between the electron domain geometry and the molecular geometry and works through several examples showing how to determine the electron domain geometry and the molecular geometry from the Lewis structure.

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00:00 Lesson Introduction
00:36 VSEPR Theory
01:36 Electron Domain Geometry
04:37 CO2, BCl3, and CH4 Molecular Geometry
06:18 SO2 Molecular Geometry (Bent)
07:04 H2O Molecular Geometry (Bent)
08:15 NH3 Molecular Geometry (Trigonal Pyramidal)
10:28 NH3 Bond Angle
11:25 H2O Bond Angle

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